[Bug] Anthropic API Error: Internal Server Error (500)

Bug Description
⏺ universal-test-architect(Phase 2 DO - Router integration tests)
⎿ Done (63 tool uses · 0 tokens · 9m 44s)
⎿ Found 7 new diagnostic issues in 2 files (ctrl-o to expand)
⎿ API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":null}

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.0.37
• Feedback ID: 1c39ffa6-f890-4add-89de-28e853508279

Errors

[{"error":"Error: EISDIR: illegal operation on a directory, read\n    at Module.readFileSync (node:fs:440:20)\n    at Object.readFileSync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:9:299)\n    at Us2 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3768:956)\n    at Object.call (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3584:909)\n    at W85 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2027:48122)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2025-11-13T23:10:53.574Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at xD (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4413)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4141\n    at Array.map (<anonymous>)\n    at bC (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4132)\n    at k02 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2169:1678)\n    at ow (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:105:19414)\n    at bt (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:42806)\n    at b9 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38347)\n    at Tp (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38275)\n    at X$ (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38129)","timestamp":"2025-11-13T23:28:48.085Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at xD (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4413)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4141\n    at Array.map (<anonymous>)\n    at bC (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4132)\n    at k02 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2169:1678)\n    at ow (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:105:19414)\n    at _b (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:3226)\n    at bt (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:43586)\n    at b9 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38347)\n    at Tp (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38275)","timestamp":"2025-11-13T23:28:48.467Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at xD (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4413)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4141\n    at Array.map (<anonymous>)\n    at bC (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4132)\n    at ycA (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1383:635)\n    at ow (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:105:19414)\n    at bt (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:42806)\n    at b9 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38347)\n    at Tp (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38275)\n    at X$ (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:107:38129)","timestamp":"2025-11-13T23:29:16.610Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at xD (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4413)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4141\n    at Array.map (<anonymous>)\n    at bC (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1278:4132)\n    at Object.T02 [as renderToolResultMessage] (file:///opt/homebrew/lib/node_mo

Note: Error logs were truncated.